Okay, when it comes to Networking I don't really know much. Just something I've never had to mess with. Anyway, we switched from Cable BB to DSL not too long ago, and ever since I've been unable to use Xbox Live to its fullest. I'm unable to actually connect/join games with *some* people. For instance, tried to play a game with a friend one night and we just couldn't connect. I couldn't join his game, and vice versa when we tried that. We couldn't even connect on the dashboard to voice chat. Further, when just playing with random people, Halo 3 matchmaking for example, I could join some games, but not others. This did have me perplexed for awhile. Then I had to the bright idea to go the Network Settings thing on the 360's dashboard and have it test the connection. It found a problem concerning something called "NAT". Said it was closed when it should be open instead. Now like I said, I don't know much about Networking. So I have no idea what "NAT" is. So I figure and hope somebody around here more than likely does and can tell what it is and how I can remedy this? It would be most appreciated.